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+# Astrolabe - Current Features List
+
+> **Purpose**: Comprehensive inventory of all implemented features for code review and optimization
+> **Created**: 2025-10-15
+> **Status**: Phases 0-10 Complete
+
+---
+
+## 🔭 **ASTROLABE - Current Features Inventory**
+
+### **1. Layout & UI Structure**
+- Three-panel resizable layout (Snippet Library | Editor | Preview)
+- Manual drag-to-resize with 200px minimum widths
+- Panel show/hide toggle buttons (📄 ✏️ 👁️ 📁)
+- Panel memory system (remembers sizes when toggled)
+- Proportional width redistribution when panels are hidden/shown
+- Layout persistence to localStorage across sessions
+- Retro Windows 2000 aesthetic styling
+
+**Files**: `panel-manager.js`, `styles.css`, `index.html`
+
+---
+
+### **2. Monaco Code Editor**
+- Monaco Editor v0.47.0 integration via CDN
+- JSON syntax highlighting and validation
+- Vega-Lite v5 schema autocomplete and intellisense
+- Format-on-paste and format-on-type
+- Read-only mode (when viewing published with draft)
+- Automatic layout resizing
+
+**Files**: `app.js` (lines 31-82), `index.html` (line 11)
+
+---
+
+### **3. Vega-Lite Rendering**
+- Live preview panel with Vega-Embed v6
+- SVG rendering for high quality
+- 1.5-second debounced rendering on editor changes
+- Immediate rendering on snippet selection
+- Error display with helpful messages
+- Dataset reference resolution (inline & URL)
+- Recursive resolution for layered/concat/faceted specs
+
+**Files**: `editor.js`, `app.js` (rendering calls)
+
+---
+
+### **4. Snippet Management (CRUD)**
+- Create new snippet (ghost card interface)
+- Duplicate snippet (with "_copy" suffix)
+- Delete snippet (with confirmation dialog)
+- Inline name editing with auto-save
+- Comment field with auto-save
+- Auto-generated ISO datetime names (YYYY-MM-DD_HH-MM-SS)
+- Unique ID generation (timestamp + random)
+- Created/Modified timestamps with formatted display
+
+**Files**: `snippet-manager.js` (lines 7-36, 621-701), `app.js` (event handlers)
+
+---
+
+### **5. Snippet Organization**
+- Multi-field sorting (Modified/Created/Name)
+- Ascending/descending toggle with arrow indicators (⬇⬆)
+- Real-time search across name, comment, and spec content
+- 300ms debounced search
+- Search clear button with enabled/disabled state
+- Visual sort indicators on active button
+- Sort preferences persisted to localStorage
+- Snippet size display (shows KB for ≥1KB snippets, right-aligned)
+
+**Files**: `snippet-manager.js` (lines 96-405), `app.js` (initialization)
+
+---
+
+### **6. Draft/Published Workflow**
+- Dual-spec storage (spec = published, draftSpec = working)
+- View mode toggle (Draft/Published buttons)
+- Status indicator lights (🟢 green = clean, 🟡 yellow = has draft)
+- Publish button (copies draftSpec → spec)
+- Revert button (copies spec → draftSpec with confirmation)
+- Context-aware button visibility (only in draft mode)
+- Auto-draft creation when editing published view
+- Read-only published view when draft exists
+- 1-second debounced auto-save for draft changes
+
+**Files**: `snippet-manager.js` (lines 494-810), `config.js` (currentViewMode)
+
+---
+
+### **7. Storage Management**
+- localStorage for snippets (5MB limit awareness)
+- Storage usage monitor with progress bar
+- Visual warning states (green/orange/red at 90%/95%)
+- Accurate byte counting using Blob API
+- Storage monitor positioned below metadata panel
+- Real-time updates after save operations
+- Quota exceeded alerts
+
+**Files**: `snippet-manager.js` (lines 3-5, 812-853), `index.html` (storage monitor UI)
+
+---
+
+### **8. Import/Export**
+- Export all snippets to JSON with auto-generated filename
+- Import from JSON with format auto-detection
+- Support for Astrolabe native format
+- Support for external formats with field mapping
+- Automatic "imported" tag for external snippets
+- ID conflict resolution with regeneration
+- Additive import (no overwrites)
+- Success/error feedback with count
+
+**Files**: `snippet-manager.js` (lines 855-976), `app.js` (lines 92-112)
+
+---
+
+### **9. Dataset Management**
+- IndexedDB storage (unlimited size, separate from snippets)
+- Multi-format support: JSON, CSV, TSV, TopoJSON
+- Multi-source support: Inline data & URL references
+- Full CRUD operations for datasets
+- Modal-based Dataset Manager UI
+- Dataset list with metadata display
+- Dataset details panel with editable name/comment
+- Statistics display (rows, columns, size)
+- Data preview (first 5 rows or URL info)
+- Copy reference button (generates `"data": {"name": "..."}`)
+- Delete dataset with confirmation
+- Refresh metadata button for URL datasets (🔄)
+- Automatic metadata calculation on creation
+- URL fetching with CORS error handling
+- Button-group UI for source/format selection
+- Unique dataset name constraint (IndexedDB index)
+- Empty state message for no datasets
+
+**Files**: `dataset-manager.js`, `editor.js` (resolution), `app.js` (event handlers), `index.html` (modal UI)
+
+---
+
+### **10. Settings & Persistence**
+- Settings storage in localStorage (separate from snippets)
+- Default settings (sortBy: modified, sortOrder: desc)
+- Settings API (load, save, get, set)
+- Panel layout persistence
+- Panel memory persistence
+- Sort preferences persistence
+- Auto-restore on page load
+
+**Files**: `config.js` (lines 19-65), `panel-manager.js` (lines 76-131)
+
+---
+
+### **11. Auto-Save System**
+- 1-second debounced auto-save for editor changes
+- 1-second debounced auto-save for name/comment changes
+- Synchronous flag (`isUpdatingEditor`) to prevent unwanted saves
+- Auto-save only in draft mode
+- Instant status light updates after save
+- Storage monitor updates after save
+
+**Files**: `snippet-manager.js` (lines 494-619), `app.js` (lines 73-75)
+
+---
+
+### **12. User Experience Enhancements**
+- Auto-select first snippet on page load
+- Relative date formatting (Today/Yesterday/X days ago)
+- Full datetime display in metadata panel
+- Empty state placeholders
+- "No snippets match your search" for search results
+- Confirmation dialogs for destructive actions
+- Flexbox layout with scrollable snippet list
+- Fixed metadata and storage monitor at bottom
+
+**Files**: `snippet-manager.js` (formatting functions), `app.js` (auto-select), `styles.css` (layout)
+
+---
+
+## 📊 **Feature Statistics**
+
+- **Core Feature Groups**: 12
+- **Total Individual Capabilities**: ~60+
+- **Storage Systems**: 2 (localStorage for snippets, IndexedDB for datasets)
+- **UI Panels**: 3 main + 1 modal
+- **Auto-save Points**: 3 (draft spec, name, comment)
+- **Data Formats**: 4 (JSON, CSV, TSV, TopoJSON)
+- **Data Sources**: 2 (inline, URL)
+
+---
+
+## 🗂️ **Code Organization**
+
+```
+src/
+├── js/
+│   ├── config.js           # Global variables, settings, sample data
+│   ├── snippet-manager.js  # Snippet CRUD, storage, search, sort (977 lines)
+│   ├── dataset-manager.js  # Dataset CRUD, IndexedDB, formats (637 lines)
+│   ├── panel-manager.js    # Layout resizing, toggling, persistence (200 lines)
+│   ├── editor.js           # Monaco setup, Vega rendering, dataset resolution (150 lines)
+│   └── app.js              # Event handlers, initialization (197 lines)
+└── styles.css              # Retro Windows 2000 aesthetic
+```
+
+**Total JS Lines**: ~2,161 lines (excluding comments and blank lines)
+
+---
+
+## 🎯 **Use This Document For**
+
+1. **Feature Review**: Select a feature to audit code relevance
+2. **Code Cleanup**: Identify potential leftovers or redundancies
+3. **Optimization**: Find opportunities to reduce codebase size
+4. **Documentation**: Reference for what's actually implemented
+5. **Planning**: Determine what to polish vs what to add
+
+---
+
+## 📝 **Next Steps**
+
+- Choose a feature number (1-12) to review in detail
+- Analyze code for that feature to ensure all parts are necessary
+- Remove dead code or consolidate redundancies
+- Document any optimizations made